Planing or slotting machine for cutting spur gear-wheels.



R. DIETEL. PLANING 0R SLOTTING MACHINE FOR CUTTING SPUR GEAR WHEELS.

APPLICATiON FILED APR. H). 1913. RENEWED OCT. 9. 1915.

R. DlETEL. mums 0R SLOTTKNG MACHINE FOR CUTTING SPUR GEAR WHEELS. APPLICATION FILED APR-10. I913- RENEWED OCT- 9,1915. 1 181,68, Patented May 2,1916.

3 SHEETS-SHEET Z.

. DIETEL. PLANING 0R SLOTTING MACHINE FOR CUTTING SPUR GEAR WHEELS.

APPLICATION FILED APR, I0. 1913- RENEWED OCT 9, I915.

1,181,6&8. Patented May 2,1916.

I 3 SHEETS-SHEET'3- 1T0 all w ham it may concern fffBeit known that I, R DoLr 'DIETEL, a fcitizen of the German Empire, residing at Dusseldorf, Germany, have invented =cer- "tam new and useful Improvements in Plan= mg or Slotting'Machines for Cutting Spur I Gear-Wheels, of which the following 18 a f specification. i heinvention relates to planingor slot ting machines for cutting spur gear wheels- .with involute teeth. and more particularly to machines in which a rolling motion along its pitch circle is imparted to the blank and recipr'ocatory motionto the cutter, whose. forward cutting edge is directed tangentially "to theroot circle of the teeth to be cut. The

blank is fed in the direction of said tangent fand simultaneously rotated about its axis, whereby a complete tooth space is cut into the blank in a continuous operation and tth blank is divided. 1i" Infithe known machines of this kind, a

screw for effecting the crossfeedof the,

worktable is connected with agworm and worm wheel for effecting therotation of the said worktable by means of gearing, whose combined velocity ratio is equalto ratio of *thepitch circle diameter of the wheel tobe "cut to the pitch circle diameterof the worm wheel multiplied by the ratio, of the pitch F 3 of said worm wheel to the pitch of the crossi lwhcel.

nected with each other by means of fixed feed screw. The gearing consists of a setof change gears for driving the cross-feed screw and whose velocity ratio is vequal to the ratio of the pitch of the worm wheelto the pitch of the wheel tobe cut, and a set of changegears for driving the wormand worm wheelfand Wl'IOSEVBlOCllZy ratio isequal to theratio of thenumber of teethof the wheel to becut {to thenuinber of teeth of the worm The setsof change gears are congearing of a velocityratio equal to theratio of the pitch of the worm wheel,, thati is to l say, the pitch of theworm to thepitch of the feed screw. .i a I u It is theobject of the present invention to dispense with'the aforesaid fixed earing,

in that the changegear train for driving the cross-feed screw or the change gear train for rotating thewor'ktable are made'to equalize or compensate at the same time the difference in pitch of the worm wheel and the I cross-feed screw. This is accomplished in such a manner, furthermore, that in one or the other of these change gears the ratio of PLANILTG on sno'r'rme MACHINE roe onr rtngsrun eneiawr nnts Specification of Letterslatei ti v P t t d M 2 ,191 I iApplication filed April 10, 1913, Serial No. 760,105. Renwed'bctober 9, 1915 Serial No. 55,113. i

- the pitch of' the tom! wheel tothat ofthe worm wheel "is multiplied by the ratio of thepitch ofthe worm wheel to the pitch of the cross-feed screw; L

' STATES RUDOLF DIETEL, or wssmnoeegemmw.

In the accompanying drawingsFigure 1 is a side elevation of a machine for cutting a spur gear .teetliwith a recipro cator'y cutting tool. .FigLQ isa partial horizontal section through the machine with the wheel blank removed. Figs; 3, 4 and 5"are =diagraminatic views illustrating the .manner of cutting a tooth space. Fig. l-shonfiing tlies'icutting tool in itsinitial position relatively to :theqwheel blankyFig. 4, similarly, the tool in its final positlm' after n pleted the cuttihg,

of a complete-tooth space; and Fig.5} various intermediate positions which the cutting tool successively assumes relatively to the Y wheel blank; Figs. 6 to 8 are-fragmentary sections illiistrating transmission mechanism and extended, forpurposes of explanation, in oneplane (not projected). I

Similar characters. of reference designate corresponding parts throughout the several views.

Referring to the drawings-a designates f-the worktablewhich is carriedfby the bed of a slott ng machineof any desired construction and which worktable is arranged tobe fed along the bed byfisuitable; earing j in well-known manner, said feed, however,

having no relation to the subject matter of the present invention. The table a is, furthermore arranged tohave' across feed and a rotation about its vertical axis', bo'th motions being obtained from a main driving shaft 6" atone side of;the'machine.-.Th

shaft Z2 is rotatediintermittently at each "stroke of the tool ra n at the end of each stroke of the cutting toolcby means of a pawl d, ratchet "d and bevel gears-d -Rotation of the shaft 'b'is transmitted through bevel gears e to a shaft f, and thence through a gearh and gears 0 'ofvariable speed ratio to a cross-feed screw g4 'Wheehhcarries onehalf of a clutch'z' whose other half is fixed'to a sleev'efic which is-rotatableeon and longitudinally movable along the shaft f, Upon the sleeve his fixedly s'ecured'a gear wheel] ifwhich, through a set *of change "gears p; is connected with a worm shaft mt-"The clutch i is so constructed that onlyin a particular position of the two-halves thereof can the faces of the same be brought into engage- I the, cross-feed of the table a by means of a ally The velocity ratios of the gearing between shaft 1 and feed-screw g and between the shaft f (sleeve 7c) and the worm shaft m may be readily varied by accordingly changing the respective change gears 0 or p, as is well understood. .The feed-screw 9 effects nut 00 secured thereto and engaging said feed-screw. The worm g engages a worm 'wheel r fixed to the worktable and to which to be cut to the so it, therefore, communicates its rotary Inction. j

To effect the cutting of the teeth, the cross-feed and the rotation-of the blank 8 must be so related that the motion of the said wheel blank is equivalent to the rolling motion of a toothed wheel, having a pitch circle of equal diameter, along a rack. In order to obtain this motion, the velocity ratios of the gearing for the cross-feed and rotation of the worktable are so chosen that the ratio of the number of turns of screw g to the number of turns of the shaft f is suited to the ratio of the pitch of the wheel pitch of'the dividing or worm wheel multiplied by the ratio of the pitch of the said worm wheel r to the pitch of the .said cross-feed screw 9; while the ratio of the number of turns of the shaft f ,to the number of turns of the shaft m is .suited tothe ratio ofthe number of teeth of the wheel to be cut to those of'the dividing or worm wheel. The speed of the crossfeed of the worktable is, therefore, as in the well-known machines, with respect to the peripheral velocity of the dividing or worm wheel 11 as the pitch diameter of the wheel v to be cut is to the pitch diameter of the said dividing wheel. It follows, therefore, that the velocity of crossfeed of the blank is equal to the peripheral velocity at the pitch circle, that isto say, the motion of the blank v is equivalent to the rolling motion of a toothed wheeh-having a pitch circle of equal diameter; alonga rack.

To cut a gear wheel, the blank 8 is. secured in well-known manner to the worktable a,

and before beginning the cutting is placed in a position with' respect to the cutting tool 0 as set'forth in Fig. 3, that is to say, with theforw'ard cutting edge of the tool tangential to the root circle. of the teeth vto cut. During the reciprocatory ,motion of the tool o, the blank is, by means of the hereinbefore described gearing, translated along said tangent toward thecuttin-g tool and at the same time rotated about its vertical axis away from the tool, various positions of the tool relatively to' the blank being shown in Fig. 5. At the end of the cutting operation, after a complete tooth space has been cut as shown in Fig. 4, the motion is reversed and blank is returned to its-initial position by means of a suitable crank which may be attached to the shaft m or screw 9. The clutch is then disengaged and,- the shaft m turned independently of the spindle 9 through a complete turn, whereupon the sleeve of clutch z' is automatically rengaged through the action of the spring a. Since the ratio of the number of turns of sleeve k to the worm shaft m is suited to the ratio of the number of teeth of the dividing Wheel, the blank is turned after a complete turn of sleeve k through an angle corresponding to the pitch of the wheel 'to be cut. The cutting tool is then in position to begin to cut the next tooth.

Should it be desired to cut Wheels having teeth ofdifferent pitch or number, it is necessary only to alter the change gears 0 of the drive between the shaft f and spindle g or the change gears 10 between shaft and the Worm shaft m. Should it be de-' medium of the clutch 2', but a different divlding means must be provided and which shall operate upon the worm shaft m, for

example, an indexing disk or dividing wheel.

As disclosed'in Fig. I, the drive for the worm shaft is provided with an index disk ;I which is fixedly secured to a wheel fl/' of the said drive and mounted upon the Worm shaft m, said Wheel y and its attached index disk 7 being loose upon the said shaft and rotatable thereon. The coupling of the index 1 and wheel y to the worm shaft m is effected by means of a pin 2 carried by an arm a fixedly secured the index disk, as is well understood. During the cutting of a tooth space, the index disk 1 and the wheel 9" are coupled to the shaft m as aforesaid. When it is desired to divide, preferably after the blank has been returned to its initial position with respect to the cutting tool as hereinbefore set forth,-

pin a is withdrawn from the index disk y. The shaft m may then be turned, independently of its gearing, by means of arm a through the proper angle, which angle is obtained by reference to the index disk. The coupling of the shaft to its change gearing is again effected through the in 2. In consequence of the fact that the clutch i is no longer necessary with the aforesaid to said shaft and l adapted to engage suitable perforations of 45 a those oftbe dividing wheel. The combined construction, wheel h of the shaft f-imay be directly connected to the change gears p for effecting the rotation of the blank.

In employing the index disk 3 or a dividing wheel, the combined-velocity ratio 3 offthe gearingb'etween the cross-feed screw g and the worm shaft m, whichmust always be equal to the ratio of the pitch circle diameter of thewheel to be cut to the pitch circle diameterof the dividing wheel multipliedby the ratio of thepitch of worm to the pitch of cross-feed screw {7, maybe obtained in any suitable manner in the gearcross-feed screw and It is to be noted paring between the said the said Worm shaft.

fiticularly thatthe velocity ratio of the shaft f; to the worm shaft m need not be proporp tioned to theratio of the number ofteeth ofthe wheel to be cut to thoseof the di i viding wheel. v

In F 8 is shownstill another exan' ple i of the manner of effecting the transmission.

a worm shaft'm from an independentshaft u,

The arrangement therein set forth "provides for the fldrive'for-the cross-feed screw 9, from anindependentshaft f and the drive for the r both shafts, however. deriving their motion fromgthe main driving shaft 6. Thetwo shafts; and u are connected, throughbevel gears o andw respectively: with the drivin; shaft 7) and whose velocity ratios are in the same proportion to each other as the the pitch of the cross-feed screw 9 be one halfthat ofthe dividing wheel r. the velocity ratio of shaft 7) to the shaft 13 will then i shaft at. 9:1.

portional to the ratio of the a, cut;

bel zl and velocity ratio of the shaft 7) to The velocity ratio between the shaft 15 and the cross-feed screw is prodividing' wheel to that of the wheel to be and the velocity ratio between the shaft "21/ and the worm shaft in proportional to the IlllllllJLfUf teeth of the wheel to be out to velocitywatio between the cross-feed screw g and theworm shaft m i-s. therefore, pro- :portional to the ratio of the pitch 'circle dian'leter of the wheel to be cntto that of theq'lividin e wheel. whereby the blank has,

with respect to the cutting tool. a rolling motion equivalent to that of a toothed wheeL I having a pitch circle of equal diameter,

The clutch i isprovi'ded on theshaft u. the bevel gear to being loose upon said shaft and attached to one of the alonf: a rack.

i halves of the clutch. while the sleeve is,

i carlgving the othcr half and the Wheel Z SGDui 1/. i The dividing is effected in manner-similar to that set forth in connection withthe V "a driving shaft therefor; andequalizing or rated from each other. is ke ved tothe shaft machine shown in Figs. 1 and 2.

lhe fixed earin -for e ualizin or compensating for the difference between the pitch of the pitch of the worm. to turn the worktable, and the pitch of the cross-feed screw may thus be done away with; and the drive for the'cros's-feed, as well as the drive for effooting the rotation of the worktable may pitch of the worm wheelythat is to say, the

each be actuated froman independent shaft, i

the ratio of the pitch of the worm to the" pitch of the cross-feed screw being equalized or compensated by suitable choice of the velocity ratios of the bevel gears connecting the two saidactuating shafts with the main driving shaft. Moreover, if the pitch of the dividing wheel be equal to the pitch ;of the cross-feed screw, the fixed gearing between the sets of change gears of course becomes unnecessary and the drive for the cross-feed may be directly connected with the drive for effecting rotation of the worktable I claim 2-- I a v 1. In a .machineof the character set forth: a worktable ancl-avfeed screw to impart a cross-feed motion thereto, a worm wheel and worm shaft to rotate theworktable, and intermediate ronnectmg gear-mg whose combined velocity ratioiis equal to the ratio of 1 the pitch circle diameter of the wheel to'be cut to. the pitch circle diameter of the Worm wheel multiplied by the ratio of the pitch of the worm wheel to the pitch of the crossfeed screw; change gearing for effecting the cross-feed and havinga velocity/ ratio equal to the pitch of the wormwheeltoithe pitch of the \vheelto be cut; change gearing for effecting the rotation of the ,worktable and having a velocity ratio equal to the number of teeth of the wheel to be out to the numher of teeth of. the wornrwheel; and equalc izing or compensating gearing included in one of said sets of change gearing-rand havine a velocity ratio equal to the pitch of the v cross-feed screw to the pitch of the worm.

In a machine of the character set forth: a worktable and a. feed screwtoimparta crossfeied motionthereto; a worm wheel and worm shaft to rotate the worktable, and inte1""ediate. eonnectinggea'ring whose combined velocity ratio is equal to theratio of the pitch circle diameter of-the wheel'to be cut to the pitch circlediameter of theworm wheel multiplied by the ratio of the pitch of the worm wheel to the pitch of the crossfeed screw; a main driving shaft;fchange gearing for effecting the cross-feed a nd having, a velocity ratio equal to thepitch' of the worm wheel to thepitch of the wheelito be cut; a (n-1mg shaft therefor; change gearins: for-effect ng the rotation of thef worktable and having a velocity, ratio equal to the number of teeth of the wheel to be cut to thenu'mber of, teeth of the Worm Wheel;

riving shaft for the cross-feed and with 1e said driving shaft for effecting the rotaon, the velocity ratios of the said'respecuve compensating or equalizing gearings bearing to each other the same relation as the pitch of the cross-feed screw to the pitch of the Worm wheel.

a worktable and a feed screw worm Wheel to the pitch 3, In a machine of the character set forth: to impart a cross-feed motion thereto, Worm shaft to rotate the worktable and intermediate connecting gearing whose c0mbined velocity. ratio is equal to the ratio of the pitch circle diameter of the wheel to be cut to the-pitch circle diameter of the worm wheel multiplied by the ratio of the pitch of the worm wheel to the pitch of the crossfeed screw; a main driving shaft; change gearing for effecting the cross-feed and having a velocity ratio equal to the pitch of the of the wheel to be out; a driving shaft therefor; change gearing for eflecting the rotation of the worka worm wheel and table and having a velocity ratio equal to the number of teeth of the Wheel to be cut to the number of teeth of the Worm wheel; a drivingshaft therefor; equalizing or compensating gearings connecting said. main driving shaft respectively with the said driving shaft for the cross-feed and with the said driving shaft for effecting the rotation, the velocity ratios of the said respectlv'e compensating or equallzmg gearlngs bearing to each other the same relation as the pitch of the cross-feed screw to the pitch of the worm Wheel; and disengaging means included in the compensating or-equahzlng gearing for the drive shaft of the rotation I 

